Viburnums bloom in white in the last part of April through early May. They vary in their height, spread, and style of flower but are similar in preferring sun to part shade and in being disease and pest resistant. While most flowers are unscented, those that are fragrant are wonderfully so. An interesting source of diversity in the viburnums comes with the leaf shape and texture. The fruit is often also of visual interest, with red, to dark purple to black berries, which often serve as an important food source for birds.